The correct answer to this open question is the following.
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Wendell Smith had such a personal stake in the success of Jackie Robinson because he covered and supported his career from the very beginning.
Wendell Smith had chosen three African American players to participate in a tryout for the Boston Red Sox. One of them was Jackie Robison, who, at that time, played for the Kansas City Monarchs. He was a shortstop.
For whatever reasons that try-out was canceled, but at that moment Smith received a call from Branch Ricky, the General Manager of the Brooklin Dodgers, and that is when Smith talk to Rickey about the quality of Robinson as a baseball player.
